What Is the Construction Process for Retrofitting Existing Building Exterior Walls with UHPC Panels? Urban Renewal and Qinglong Group's Efficient Renovation System

Retrofitting existing building façades with UHPC panels is a systematic project that must follow the principles of "inspection and assessment, design adaptation, rapid installation, and minimal disruption." Its core process comprises six stages: "site survey, scheme design, substrate treatment, keel installation, panel hanging, and closure sealing." In a renovation project for an old office building in Shenzhen, Qinglong Group innovatively adopted an integrated "measurement–design–production–installation" model: three-dimensional laser scanning captured data of the original walls (accuracy ±2mm), with BIM models optimizing panel segmentation; a light steel keel system was used to accommodate uneven substrates; custom panels reserved openings for equipment; and dry construction achieved a daily renovation area of 300㎡, shortened the construction period by 50%, and allowed the building to operate normally throughout construction. Renovation projects are the ultimate showcase of UHPC's lightweight and highly efficient advantages.

Precise Surveying and Adaptive Design Are the Foundation of Success

Combining UAV photogrammetry with three-dimensional scanning generates a digital model of the existing building, precisely locating obstacles such as window openings and pipelines. Modular panel types are used in the design to reduce the proportion of non-standard components. In the renovation of a historic district in Nanning, we used parametric design to optimize 287 panels into 12 standard panel types, reducing mold costs by 40%.

Substrate Treatment and Keel Leveling Ensure Installation Precision

Pull-out tests are conducted on the original walls, and areas with insufficient strength are reinforced with structural adhesive-anchored rebar. An adjustable keel system is used, achieving an overall façade flatness of ≤5mm/2m through bolt adjustment. Our patented "universal connector" can absorb substrate deviations of ±15mm.

Rapid Hanging and Finished-Product Protection Reduce Impact

A "bottom-first, top-later, segmented construction" strategy is adopted, with independent construction gondolas set up to avoid damaging the original structure. Panels come pre-fitted with fasteners and are hung directly on site, with installation time per panel ≤15 minutes. Completed areas are immediately covered with protective film to prevent dust and impact damage.

New-Old Interface Sealing and Function Restoration

Window openings use dedicated closure profiles with flexible connections to the original window frames. Access panels are pre-installed at pipeline entry and exit points. We prepare detailed closure detail drawings for each project to ensure unity of aesthetics and function.

UHPC provides a fast, high-quality solution for urban renewal. With extensive renovation experience, Qinglong Group brings new life to old buildings.